using System;
using System.Text.RegularExpressions;

namespace Application
{
class MainClass
{
    public static void Main (string[] args)
    {




        string text = "213.123.11.0 455.121.123.123 0.0.0.0.0 asdasdad ";

        }
        Regex r = new Regex ("\b[0-255].[0-255].[0-255].[0-255]\b");
    Console.WriteLine(r.Match(text));
        Console.ReadKey ();
    }
}